Got most of admin panel working. Data issues fixed

OpenArchival.DataAccess/Providers/ArtifactGroupingProvider.cs

@@ -6,11 +6,11 @@ namespace OpenArchival.DataAccess;
 
 public class ArtifactGroupingProvider : IArtifactGroupingProvider
 {
-    private readonly ArchiveDbContext _context;
+    private readonly ApplicationDbContext _context;
     private readonly ILogger<ArtifactGroupingProvider> _logger;
 
     [SetsRequiredMembers]
-    public ArtifactGroupingProvider(ArchiveDbContext context, ILogger<ArtifactGroupingProvider> logger)
+    public ArtifactGroupingProvider(ApplicationDbContext context, ILogger<ArtifactGroupingProvider> logger)
     {
         _context = context;
         _logger = logger;
@@ -18,12 +18,18 @@ public class ArtifactGroupingProvider : IArtifactGroupingProvider
 
     public async Task<ArtifactGrouping?> GetGroupingAsync(int id)
     {
-        return await _context.ArtifactGroupings.Where(g => g.Id == id).FirstOrDefaultAsync();
+        return await _context.ArtifactGroupings
+            .Where(g => g.Id == id)
+            .Include(g => g.Category)
+            .FirstOrDefaultAsync();
     }
 
     public async Task<ArtifactGrouping?> GetGroupingAsync(string artifactGroupingIdentifier)
     {
-        return await _context.ArtifactGroupings.Where(g => g.ArtifactGroupingIdentifier == artifactGroupingIdentifier).FirstOrDefaultAsync();
+        return await _context.ArtifactGroupings
+            .Where(g => g.ArtifactGroupingIdentifier == artifactGroupingIdentifier)
+            .Include(g => g.Category)
+            .FirstOrDefaultAsync();
     }
 
     public async Task CreateGroupingAsync(ArtifactGrouping grouping)
@@ -38,9 +44,37 @@ public class ArtifactGroupingProvider : IArtifactGroupingProvider
         await _context.SaveChangesAsync();
     }
 
+    public async Task DeleteGroupingAsync(int id)
+    {
+        await _context.ArtifactGroupings
+            .Where(p => p.Id == id)
+            .ExecuteDeleteAsync();
+
+        await _context.SaveChangesAsync();
+    }
+
     public async Task DeleteGroupingAsync(ArtifactGrouping grouping)
     {
         _context.ArtifactGroupings.Remove(grouping);
         await _context.SaveChangesAsync();
     }
+    
+    public async Task<List<ArtifactGrouping>> GetGroupingsPaged(int pageNumber, int resultsCount)
+    {
+        if (pageNumber < 1 || resultsCount < 1)
+        {
+            throw new ArgumentOutOfRangeException($"Either page number or number of results was less than or equal to 0. {nameof(pageNumber)}={pageNumber} {nameof(resultsCount)}={resultsCount}");
+        }
+
+        var totalCount = await _context.ArtifactGroupings.CountAsync();
+
+        var items = await _context.ArtifactGroupings
+            .Include(g => g.Category)
+            .OrderBy(g => g.Id)
+            .Skip((pageNumber - 1) * resultsCount)
+            .Take(resultsCount)
+            .ToListAsync();
+        
+        return items;
+    }
 }